Swansont, I meant: a spiral to keep centripetal accerleration constant while the object accelerates at a certain value forwards (constant tangential acceleration). Sorry for not being precise in my final question.
Further Studiot, I dont think the archemedian sprial will keep centripetal acceleration constant while the object is accelerating tagentaly. This is because the change in radius over time (dr/dt) is not constant to keep the centripetal accerleration constant, and the archemedian spiral assumes a constant increase in radius between turning points at a constant angular velocity therefore in the archemedian spiral dr/dt=constant.